Kobe Steel, Ltd.

Tatsu Fujita

Yoshiro Yamada

Tetsuo Yamada

Atsuo Mizuta

Shinichi Shimazu

Tsugio Kaneda

Nobuyasu Hatsuoka

Noboru Yamakoshi

Yoshihiro Yamaguchi

Tomiharu Matsushita

Takefumi Horiuchi

Masao Nishihara

Heijiro Kawakami

Masataka Noguti

Kiyoshi Matsumoto

Yoshiyuki Monju

Osamu Tsuda

Tsunesaburo Asada

Yukio Wada

A large gauge high strength steel rod having a diameter of not less than 9 mm, is produced from high carbon steel containing, by weight percent, from 0.65 to 0.90% carbon and from 0.15 to 1.5% chromium capable of being drawn without subsequent heat treatment.

High strength steel rod of large gauge

Method of producing large diameter steel rods

A method and apparatus for cooling a rod of a coil form, immediately after the hot-rolling thereof and within which the rod, whose loops are spaced a given pitch from one another, is laid flat upon a chain conveyor, and more particularly upon rails thereof, and transported therealong by means of endless chains, includes the cooling of the rod with cooling fluid or air which is introduced from below the cooling floors through means of nozzle portions formed within the bodies of the cooling floors. The method and apparatus features the arrangement and construction, including the configuration, of the nozzle portions thus formed, the cooling fluid being projected upwardly at an angle within the range of 10.degree.-70.degree. with respect to the plane of the cooling bed, and horizontally at an angle within the range of 10.degree.-150.degree. with respect to the transporting direction of the rod, towards the rod directly above the rail and chain portions of the conveyor, as well as being projected upwardly at an angle within the range of 15.degree.-75.degree. with respect to the plane of the cooling bed, and horizontally at an angle within the range of 30.degree.-150.degree. with respect to the direction of the transportation of the rod, towards the overlapped, sidewise circumferential portions of the rod. Thus, uniform cooling may be achieved over the entire length of the coiled rod.

Method and apparatus for cooling hot rolled rod

A method for cooling a steel wire which is being drawn in a dry lubricant wire drawing operation wherein the rear portion of the die, including the backrelief portion thereof and the wire which has just been drawn to the desired dimension, are brought into direct contact with a cooling medium so as to effect forced cooling thereof, the wire thereby being cooled before the commencement of strain-aging embrittlement within the wire.

Method of cooling steel wire

In the manufacture of compound billets composed of two or more different metals for use in hydrostatic extrusion, care must be exercised to see whether or not products possessing a predetermined compound status are produced from the compound billets by means of the hydrostatic extrusion process. The compound billets manufactured through the method of this invention do not, in the hydrostatic extrusion process, possess the usual defects caused by discrepancies between the mechanical properties of a plurality of different metallic materials constituting the billets, especially, and in particular, it is true that the compound billets are free from defects caused by surface slip taking place between the surfaces of the internal and external layer materials of the compound billet of the different metallic materials, and the method according to the present invention is characterized in that the formation of the nose part is undertaken by plastic forming of the same, such as roll forming and swazing, from the outside while maintaining an interior condition wherein air is expelled from the space formed between the contacting surfaces of the different metallic materials. As a result, the materials are mechanically bonded together and the surface areas of the materials of the billet at the deformed nose portion to be presented to the die are equal and it becomes possible to carry out a hydrostatic extrusion of the compound materials under a combination of different metallic materials covering an extremely wide selection.

Method of manufacturing compound billets for hydrostatic extrusion

Growing community of inventors

Kobe, Japan

Tatsu Fujita